Plywood testing, three major processes are indispensable

Plywood testing, three major processes are indispensable

In the production of plywood, almost every process affects the bonding quality of plywood to some extent. In order to master it easily, the key items of plywood testing are summarized as follows:

1. Adhesive quality: the performance of synthetic resin adhesive for adhesive, the combination of each component and the mixing process. In recent years, a lot of research work has been done on the components and mixing process of plywood adhesive in China, which not only saves a lot of chemical raw materials, but also reduces the product cost and improves the properties of the products. This is the performance of technical progress. In the production, only the synthetic resin used has good performance, enough bonding strength, reasonable distribution ratio of each group of adhesives, stable performance of the prepared adhesive, appropriate resin content and viscosity, and long enough active period can ensure normal operation and all indexes of products meet the requirements.

2. Veneer quality: veneer quality, especially its surface state, has a great influence on the detection strength of plywood. The veneer quality should be paid enough attention to in the preparation of wood section and veneer rotary cutting process, wood softening treatment should be carried out well, the rotary cutting conditions should be well controlled to make the veneer indicators in the best value, at the same time, attention should be paid to the moisture content and flatness of veneer.

3. Plywood bonding test: before gluing, pay attention to the two links of glue amount and slab aging. If the amount of glue is too large, the cost is high; if the adhesive layer is too thick, the internal stress will increase, and at the same time, it is easy to penetrate the glue; if the glue content is too small, it is not conducive to the infiltration of the glue solution, and the adhesive layer will be incomplete. The aging time should be appropriate, and it should change reasonably with the climate change. It is necessary to realize the whole tension of the core plate and reduce the lamination and joint separation of the core plate. Attention should be paid to the speed of pressing and depressurizing, especially when there is more moisture in the slab.

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